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Smart casual dressing is also known as business casual and is usually the preferred dress code for most professional settings like an office, symposiums, academia, church, and some school activities. The function of smart casual dress is to make the person look well put together and professional, but in a slightly more relaxed environment.
Smart casual or business casual dress for men is a clean, ironed shirt with a collar (like a polo or button down) and only a jacket if the weather permits. Another thing to remember is that business casual also usually means no tie.